When you press the power button on the computer, the operating system does not start immediately. After some time the operating system is turned on. In this post I will discuss in detail how the operating system is turned on after pressing the power button of the computer and BIOS and UEFI. UEFI is related to BIOS so let’s first learn about BIOS.

What is BIOS?

Basic Input Output System (BIOS) Full Basic Input Output System. A BIOS is a small piece of code or program that resides inside a ROM-like chip on a computer’s motherboard. It is also called motherboard firmware. This program is first launched by pressing the power button on the computer. BIOS does a lot of normal work. But these tasks are very important for the computer. It initializes the hardware during the process of starting the computer. This allows the software to connect to the hardware. So let’s find out how BIOS works.

When the power button of the machine is pressed, power supplies to the motherboard. This will trigger the process of turning the machine on. Next, the BIOS would turn on all hardware connected to the motherboard. Then verify that all hardware is functioning via POST properly. Shows the way to get to the BIOS settings on the display screen when the post is completed. The BIOS settings can only be managed by the keyboard.

BIOS Settings

You must click the required key from the keyboard in order to access settings. This key depends on the manufacturer of the motherboard. In the settings you can pick some essential details. For example: date and time, order of boot etc. The boot order first explores which computer the operating system should be started in mind. Typically the hard drive comes first and then another computer be selected in the boot order. In the order of boot you first need to pick a pen drive or CD / DVD when the operating system is set up again. Pressing the key from the settings key continues to scan for the computer to launch the BIOS operating system. The operating system begins when the computer is located. Actual operating systems can connect to the hardware directly. Then the BIOS doesn’t work any more.

What is UEFI?

Total Extensible Unified Firmware Interface of UEFI. UEFI is BIOS ‘latest release. This motherboard is in modern use. Now there is the issue of what it took to make BIOS modern. BIOS had some restrictions as it was used in older computers. One is helping the move. Previously, machine hard disks used partitioning schemes for MBR or master boot records. Only 2 terabytes and 4 primary partitions will build this partition structure on a hard disk. With UEFI a new partition scheme has been developed to address all these problems in modern times. This allows you to build up to a limit of 128 partitions using a hard disk such as Terabyte or Petabyte Jetabyte. UEFI is generated through graphical user interface animations. The mouse and keypad can be controlled. Here you can directly display the temperature of the processor, voltage, fan speed of the motherboard and more detail.

UEFI Settings